Tag Archives: igneous

Radioactivity of Geological Materials

Primeval elements with long half-lives such as potassium (40K), thorium (232Th), and uranium (235U, 238U produce elements with shorter half-lives as part of the decay process. Other primeval elements such as calcium (48Ca), vanadium (50V), and nickel (58Ni) are either … Continue reading

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Density

Density (ρ) is the mass (m) of a material divided by its volume (V), given in units of mass per unit volume (kg/m3): ρ = m/V The density of a material is a function of the density of the individual … Continue reading

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Porosity and Permeability

Porosity is the number of pores per unit of volume in soil. Porosity may decrease through packing or compaction, increase through dilation during shear, or change when fines are transported from one area to another. Materials with higher porosity have … Continue reading

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